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首页> 外文期刊>Journal of King Saud University >Application of geoelectric methods on paleoenvironments of the Qa'el-Jufr lake, southeastern Jordan Plateau
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Application of geoelectric methods on paleoenvironments of the Qa'el-Jufr lake, southeastern Jordan Plateau

机译：地电方法在约旦高原东南部Qa'el-Jufr湖古环境中的应用

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Resistivity sounding measurements were conducted on the Qa'el-Jufr lake, southeastern Jordan Plateau, with the aim of mapping of Quaternary medium and establishing the role of palaeoclimate deposition. Data collected at 20 locations were interpreted with curve matching techniques and 1-D inversion program in order to obtain final earth models. The results of interpretation and calibration are used to construct litho-resistivity cross sections across the study area in light of the surface and subsurface geological information. The inspection of litho-resistivity cross sections reveals the presence of two main alluvial sequences. The upper sediments that attain resistivities ranging from 5 to 120 Ωm and thickness ranging from 6 to 18 m are a mixture of reworked aeolian and alluvial sediments. The resistivity of this unit generally decreases south and centralwards, indicating more homogeneous fine silty sand nature of the Pleistocene sediments. The lower stratigraphic unit is the shallow sand and gravel layer saturated with fresh water. This layer is characterized by its relatively high resistivity (60–400 Ωm) and varying thickness (8–23 m) in the northern and eastern sides and by its relatively low resistivity (20–90 Ωm) and varying thickness (10–40 m) in the southern side. Geoelectrical data analyses of Qa'el-Jufr basin provide an important record of Quaternary paleoenvironments for the Jordan Plateau and evidence of several significant changes in climate regime. Gravels, sands and clays characterizing the deepest sediments demonstrate significant lacustrine and high moisture phase. Then the sediments grade upwards to sands and silts that may represent a gradual drying of the lake and increased aeolian activity. These new records of the paleoenvironments provide an important context to the archaeological record of the Jordan Plateau during Quaternary. Several archaeological surveys demonstrate extensive human exploitation of lakes and springs of the major wadis along the western margin of the Rift Valley. However, very little is known about the human exploitation of the desert interior. Qa'el-Jufr sediments demonstrate significant lacustrine and high moisture phases sufficient for human exploitation of the eastern desert during the Pleistocene.
机译：在约旦高原东南部的Qa'el-Jufr湖上进行了电阻率测深，目的是测绘第四纪介质并确立古气候沉积的作用。为了获得最终的地球模型，使用曲线匹配技术和一维反演程序解释了在20个位置收集的数据。根据地表和地下地质信息，解释和校准的结果将用于在研究区域内构造岩石电阻率剖面。岩石电阻率截面的检查显示存在两个主要冲积层序。电阻率范围为5至120Ωm且厚度范围为6至18 m的上部沉积物是返修的风沙和冲积物的混合物。该单元的电阻率通常会向南和向中央减小，这表明更新世沉积物的粉质细粉沙质更加均匀。较低的地层单位是充满淡水的浅砂砾层。该层的特点是在北侧和东侧具有较高的电阻率（60–400Ωm）和变化的厚度（8–23 m），并且具有较低的电阻率（20–90Ωm）和变化的厚度（10–40 m） ）在南侧。 Qa'el-Jufr盆地的地电数据分析为约旦高原的第四纪古环境提供了重要记录，并证明了气候体制的若干重大变化。代表最深沉积物的砾石，沙子和粘土表现出明显的湖相和高水分相。然后，沉积物向上逐渐上升到沙和淤泥，这可能表示湖泊逐渐干燥并增加了风沙活动。这些新的古环境记录为第四纪约旦高原的考古记录提供了重要的背景信息。几项考古调查表明，人类对裂谷西部边缘的主要河谷的湖泊和泉水进行了广泛的开采。但是，对于人类对沙漠内部的开发知之甚少。 Qa'el-Jufr沉积物显示出重要的湖相和高水分相，足以在更新世期间人类对东部沙漠的开采。

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